They say that outgoing voice quality on the phone connected to the Scout isn't as good as the ones directly connected to the Hub; not much difference to me but I can tell it is more staticky.

Instead of using the phone port on the Scout to connect an additional phone, I'd look into distributing Ooma dialtone throughout your house. You can even mix in the HPNA signal from Hub's wall port into the dialtone before you distribute so you can either plug in a phone or a scout at any phone jack.